body {
    font-family: "Microsoft YaHei", sans-serif;
    background-image: url(./indeximg/file.jpeg);
    background-repeat: no-repeat;
    background-size: cover;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    list-style: none;
}

a {
    text-decoration: none;
}

h3 {
    text-align: center;
}

.nav {
    width: 100%;
    margin: 0 auto;
    background-color: #696868;
    color: #fff;
    padding: 10px;
    text-align: center;
    border-radius: 20px;
}

.nav ul li {
    display: inline-block;
    color: #fff;
    text-decoration: none;
    margin: 0 10px;
}

.nav ul li a {
    color: #fff;
    font-size: 18px;
}

.nav ul li a:hover {
    background-color: #585757;
    border-radius: 30px;
}

.frama {
    margin: 0px auto;
    width: 1000px;
}

.con {
    margin: 0px auto;
    padding: 20px;
    font-size: 18px;
}

.jianjie {
    padding: 10px;
    backdrop-filter: blur(5px);
    border: 1px solid #fff;
    border-radius: 10px;
    font-size: 18px;
    box-sizing: border-box;
}

.jianjie a {
    color: #000;
}


.chengyuan {
    padding: 30px;
    backdrop-filter: blur(5px);
    width: 1000px;
    border: 1px solid #fff;
    border-radius: 10px;
    box-sizing: border-box;
}

.chengyuan1 {
    height: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}

.chengyuan1 .ren {
    flex: 2/3;
}


.chengyuan1 h4 {
    font-size: 20px;
}

.chengyuan1 p {
    color: #585757;
}


.chengyuan1 img {
    width: 100px;
    height: 100px;
    border-radius: 100px;
}

.video {
    backdrop-filter: blur(5px);
    width: 1000px;
    height: 100%;
    border: 1px solid #fff;
    border-radius: 10px;
}

.video img {
    width: 100%;
    height: 100%;
}